<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .left {
            width: 200px;
            height: 300px;
            background-color: green;
            float: left;
        }
        .section {
        }
        .center {
            height: 350px;
            background-color: blue;
            margin-left: 210px;
            margin-right: 210px;
        }
        .right {
            width: 200px;
            height: 300px;
            background-color: red;
            float: right;
            margin-top: -350px;

        }
    </style>
</head>
<body>
<h1>这是横向的标题</h1>
<div class="section">
    <div class="left"></div>
    <div class="center">aaaaa</div>
    <div class="right"></div>
</div>
</body>
</html>